Android权限:用户按"允许"后执行任务

Question

我想知道当用户按下"允许"按钮进行联系方式访问/日历访问等时,我们是否有办法识别事件,

我知道有一种方法可以通过ActivityCompat.requestPermissions请求权限,但有没有办法在用户授​​予权限后立即执行操作？

Answer 1

首先定义变量:

public static int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;

请求权限使用:

if (ActivityCompat.checkSelfPermission(this,
        android.Manifest.permission.ACCESS_FINE_LOCATION)
        != PackageManager.PERMISSION_GRANTED) {
    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(this,
            android.Manifest.permission.ACCESS_FINE_LOCATION)) {
        // Show an explanation to the user *asynchronously* -- don't block
        // this thread waiting for the user's response! After the user
        // sees the explanation, try again to request the permission.
    } else {
        // No explanation needed, we can request the permission.
        ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
        // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }
}

现在使用以下方法捕获结果

     @Override
public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION : {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // contacts-related task you need to do.
                Toast.makeText(getApplicationContext(), "Permission granted", Toast.LENGTH_SHORT).show();

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(getApplicationContext(), "Permission denied", Toast.LENGTH_SHORT).show();
            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}

对于碎片

如果您在a中尝试此代码fragment,请更改

checkSelfPermission()

至

ActivityCompact.checkSelfPermission()

而且还改变了

ActivityCompat.requestPermissions()

至

requestPermissions()

许可结果的处理(允许或拒绝)与活动相同.

有关更完整的示例,请参阅此答案